import 'dart:ffi';
import 'dart:io';

main() {
  Future.delayed(Duration(microseconds: 200), () {
    print("我是延迟的Future");
  });
  var future = Future.value("我是Future");
  future.then((value) => {
    print(value)
  }).then((value) => {print("$value again")});
  var asyncAwait = AsyncAwait();
  asyncAwait();
}

const oneSecond = Duration(seconds: 3);

class AsyncAwait {
  checkVersion() async {}
  void call(){
    print("调用call函数");
  }
}
